Shiplap is a wooden building material – essentially long, straight planks – often used in the exteriors of older ships (obviously), barns or sheds. When placed horizontally, the clean lines help create the illusion of added space.

The material also often creates a rustic contemporary feel which blends well with Gaines' modern country style (so don't expect plain ol' shiplap to make a complete disappearance from future Gaines designs).

Gaines also revealed that Season 4 of "Fixer Upper" will consist of at least eight projects and will film over eight to 12 weeks. Season 4 will also showcase more of each home being renovated; past episodes often only highlighted exteriors and a few key rooms inside. She wrote:

In season 4 you can expect to see some really unique spaces. In seasons past we've renovated whole homes, but only been able to show the exterior and a few rooms because there are only so many minutes in the show. We select the most dramatic rooms to reveal since we are limited on time. This year we'll be branching out and showing off unique sitting nooks, fun playrooms and even a space that was specially designed for a client's sweet furry friends.

Season 4 of HGTV's "Fixer Upper" is now in production in Waco and is scheduled for a fall 2016 TV return date.

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